Fix SCPyPlotExt

The `SCPyPlotExt` had two problems:

- the default argument to `pdata` is `Profile.fetch()`, but `Profile`
was not imported
- the extension was not adding methods to `SnoopCompile.pgdsgui`

As a result, the tutorial on `pgdsgui` was broken.

This commit fixes both of these issues.

ext/SCPyPlotExt.jl

@@ -1,13 +1,15 @@
 module SCPyPlotExt
 
+import Profile
+
 using SnoopCompile
 using SnoopCompile: MethodLoc, InferenceTimingNode, PGDSData, lookups
 using PyPlot: PyPlot, plt, PyCall
 
 get_bystr(@nospecialize(by)) = by === inclusive ? "Inclusive" :
                                by === exclusive ? "Exclusive" : error("unknown ", by)
 
-function pgdsgui(ax::PyCall.PyObject, ridata::AbstractVector{Pair{Union{Method,MethodLoc},PGDSData}}; bystr, consts, markersz=25, linewidth=0.5, t0 = 0.001, interactive::Bool=true, kwargs...)
+function SnoopCompile.pgdsgui(ax::PyCall.PyObject, ridata::AbstractVector{Pair{Union{Method,MethodLoc},PGDSData}}; bystr, consts, markersz=25, linewidth=0.5, t0 = 0.001, interactive::Bool=true, kwargs...)
     methodref = Ref{Union{Method,MethodLoc}}()   # returned to the user for inspection of clicked methods
     function onclick(event)
         xc, yc = event.xdata, event.ydata
@@ -48,11 +50,11 @@ function pgdsgui(ax::PyCall.PyObject, ridata::AbstractVector{Pair{Union{Method,M
     return methodref
 end
 
-function pgdsgui(ax::PyCall.PyObject, args...; consts::Bool=true, by=inclusive, kwargs...)
+function SnoopCompile.pgdsgui(ax::PyCall.PyObject, args...; consts::Bool=true, by=inclusive, kwargs...)
     pgdsgui(ax, prep_ri(args...; consts, by, kwargs...); bystr=get_bystr(by), consts, kwargs...)
 end
 
-function pgdsgui(args...; kwargs...)
+function SnoopCompile.pgdsgui(args...; kwargs...)
     fig, ax = plt.subplots()
     pgdsgui(ax, args...; kwargs...), ax
 end

src/SnoopCompile.jl

@@ -105,7 +105,7 @@ that method.
 `ax` is the pyplot axis of the scatterplot.
 
 !!! compat
-    `pgdsgui` depends on PyPlot via the Requires.jl package. You must load both SnoopCompile and PyPlot for this function to be defined.
+    `pgdsgui` depends on PyPlot via Julia extensions. You must load both SnoopCompile and PyPlot for this function to be defined.
 """
 function pgdsgui end
 export pgdsgui