bug fixed: automatically cleanup when the package level src directory is deleted and there is only BuildFile left in the package
updated ChangeLog and ReleaseNotes.txt
new RuntimeEnv.pm added for setting up runtime environemnt. It is now a plugin, so project can overrite it in its config directory
scram v2.0 for multiple arch support and big lib stuff
file ReleaseNotes.txt was initially added on branch SCRAM_V2_0.
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