pcl: import from aur
flann: import from aur
flann: whitespace cleanup and add vim modeline
flann: replace md5sums with sha256sums
flann: add dependency gcc-libs (noted by namcap)
flann: fix sed lines that convert python->python2

Some instances in the source archive already refer to python2, so these
need to be left untouched (previous sed lines would turn them into python22
which of course doesn't work)
flann: update description so it doesn't trigger a namcap complaint
guirun: add package (script only package; no separate sources)
flann: fix python binding install