[Arm-netbook] KICAD bug-fix for collaborative development

[luke.leighton]

just thought people might like to know, there has been a rather
interfering bug whereby projects with multiple .sch sheets would have
absolutely every single one of them modified due to insertion of a
completely unnecessary timestamp, in direct contravention of standard
file management procedures, you *never* make whitespace changes
especially unnecessary ones included in an actual code commit... and
they've just fixed it!  brian from the kicad developers says that the
cache files were also being unnecessarily modified, and that's been
sorted as of bzr commit 4290.

this change finally makes collaborative kicad project workflow
possible and convenient.

l.