* new image "cal_questionmark.png", will be used as a "modifier image"
  for "tempmaybe" category attribute
* recreated cal.png (and gif+xpm variants) with smooth lines

  See bbbike-aux/images/cal_questionmark.xcf for sources; needs special
  layer setting.
* reorder really-slow-checks targets

  Currently most likely target to fail is check-nearest, so run it
  first.
refactor
check for rectangle
Revert "refactor"

This reverts commit 6b2f8e4b84f2923cb006d94211d8aa1e504d5e00.

Conflicts:

	html/extract.js
fix is_rectangle usage
* ups, typo
* data update
* new module BBBikeProcUtil, currently containing double_fork function

  Together with tests.
* insert_points: use double_fork function
* renamed strassen-index.pl to Strassen::Index
* new test file for Strassen::Index
Merge remote branch 'eserte/master' into world
indent
an /robots.txt for mc.bbbike.org
Merge branch 'world' of ssh://git.bbbike.org/home/git/bbbike into world
copy of bbbike-org-mc-website.t
first working test
more tests