Made lensfun lookups for one lens really unique.  Fixes bug #9662.
rawspeed: import svn r614
Allow compilation with gcc < 4.8

Those seem to assume that enums are unsigned by default so comparisons
like "< 0" cause a warning == error.
blend: fix unsigned/int issue discovered by houz' recently added checks
check that the malloced memory is not null

should help with bug #9808
lua : add support to know and set if an image has a local copy
Merge pull request #421 from bronger/master

Made lensfun lookups for one lens really unique.  Fixes bug #9662.