fp-scan: remove -basedir and -out flags (done via -jobo)
fp-list-bldr: remove -basedir and -out flags (done via -jobo)
doc: more infos
fp-scan: more doc
fp-scan: first parse args, then print banner
fp-list-bldr: first parse args, then print banner
fp-list-bldr: more doc
all: more doc
proc: return err instead of nil (for consistency)
Merge pull request #2 from sbinet/dev/more-doc

Dev/more doc