Cleanup for v4
As discussed in LHCBPS-1808 and #19 (closed) this MR prepares a new empty AppConfig/master for future use as v4r*
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A protected v3-patches branch has been created from the current master for legacy v3r* use -
All existing options files and scripts have been removed, leaving only those in Sprucing/FEST subdirectory -
Support has been added for use of AppConfig via the PYTHONPATH -
APPCONFIGOPTS and APPCONFIGROOT environment variables has been removed. -
Remaining options files to be adapted so that they can be accessed as python functions
@clemenci could you please modify the files in options/Sprucing/FEST so that the options can be accessed as functions, as you suggest in LHCBPS-1808 and move them to python/AppConfig/Sprucing - this can then be used as examples for future updates
@gcorti @kreps @rmatev @nskidmor @pkoppenb @erodrigu FYI
Closes LHCBPS-1808 #19 (closed)