First batch of cleanup hints.
First batch of uidgid hints.
Implement control args: (1) Parsing
Implement control args: (2) cleansrccache

SBoggit: SRCDIR -> SRCCACHE; invoke cleansrccache
functions.d/buildfunctions.sh: SRCDIR -> SRCCACHE
functions.d/srcfunctions.sh: SRCDIR -> SRCCACHE; add new function cleansrccache