TcGSA 0.12.10

This is a minor release that includes:

• improved documentation
• better handling of NA values
• removed gplots dependency (only used in documentation) because gplots is orphaned
• adding partial support for group.var in plot1GS()

TcGSA 0.12.4

v0.12.4

appveyor ?

TcGSA 0.12.2

v0.12.2

appveyor ?