Allow applications to be run as scripts if desired.

This allows users to run:
```
python fusion_engine_client/applications/p1_display.py
```

in addition to the normally recommended:
```
p1_display
```

python/README.md

@@ -75,8 +75,9 @@ FusionEngine message specification.
           time-aligning FusionEngine data captured in a `*.p1log` file
       - `applications` - Applications and processing tools -- see [Applications](#applications) for detailed
         descriptions of each of these tools
-        - _The applications in this directory will be installed on your system by `pip install` along with the rest of
-          the library code so that they can be called directly from the command line_
+        - _The applications in this directory will be installed on your system by `pip install`, along with the rest of
+          the library code, so that they can be called directly from the command line (e.g., `p1_display.py` can be run
+          on the command line as `p1_display`)_
       - `messages` - Python message definitions
       - `parsers` - Message encoding and decoding support
         - [decoder.py](fusion_engine_client/parsers/decoder.py) - `FusionEngineDecoder` class, used to frame and parse

python/fusion_engine_client/applications/p1_display.py

@@ -1,5 +1,17 @@
 #!/usr/bin/env python3
 
+import os
+import sys
+
+# If this application is being run directly as a script (e.g., python p1_*.py), rather than as a script installed by pip
+# (e.g., p1_*), manually set the package name and add the Python root directory (fusion-engine-client/python/) to the
+# import search path to enable relative imports.
+if __name__ == "__main__":
+    root_dir = os.path.normpath(os.path.join(os.path.abspath(os.path.dirname(__file__)), '../..'))
+    sys.path.insert(0, root_dir)
+    __package__ = os.path.dirname(__file__).replace('/', '.')
+
+
 from ..analysis.analyzer import main as analyzer_main
 
 

python/fusion_engine_client/applications/p1_extract.py

@@ -3,6 +3,14 @@
 import os
 import sys
 
+# If this application is being run directly as a script (e.g., python p1_*.py), rather than as a script installed by pip
+# (e.g., p1_*), manually set the package name and add the Python root directory (fusion-engine-client/python/) to the
+# import search path to enable relative imports.
+if __name__ == "__main__":
+    root_dir = os.path.normpath(os.path.join(os.path.abspath(os.path.dirname(__file__)), '../..'))
+    sys.path.insert(0, root_dir)
+    __package__ = os.path.dirname(__file__).replace('/', '.')
+
 from ..utils import trace as logging
 from ..utils.argument_parser import ArgumentParser
 from ..utils.log import extract_fusion_engine_log, find_log_file, CANDIDATE_LOG_FILES, DEFAULT_LOG_BASE_DIR

python/fusion_engine_client/applications/p1_lband_extract.py

@@ -3,6 +3,14 @@
 import os
 import sys
 
+# If this application is being run directly as a script (e.g., python p1_*.py), rather than as a script installed by pip
+# (e.g., p1_*), manually set the package name and add the Python root directory (fusion-engine-client/python/) to the
+# import search path to enable relative imports.
+if __name__ == "__main__":
+    root_dir = os.path.normpath(os.path.join(os.path.abspath(os.path.dirname(__file__)), '../..'))
+    sys.path.insert(0, root_dir)
+    __package__ = os.path.dirname(__file__).replace('/', '.')
+
 from ..utils.trace import HighlightFormatter, BrokenPipeStreamHandler
 from ..utils.time_range import TimeRange
 from ..utils.log import locate_log, DEFAULT_LOG_BASE_DIR

python/fusion_engine_client/applications/p1_print.py

@@ -1,8 +1,17 @@
 #!/usr/bin/env python3
 
 from collections import defaultdict
+import os
 import sys
 
+# If this application is being run directly as a script (e.g., python p1_*.py), rather than as a script installed by pip
+# (e.g., p1_*), manually set the package name and add the Python root directory (fusion-engine-client/python/) to the
+# import search path to enable relative imports.
+if __name__ == "__main__":
+    root_dir = os.path.normpath(os.path.join(os.path.abspath(os.path.dirname(__file__)), '../..'))
+    sys.path.insert(0, root_dir)
+    __package__ = os.path.dirname(__file__).replace('/', '.')
+
 from ..messages import *
 from ..parsers import MixedLogReader
 from ..utils import trace as logging