Merge branch 'master' of git://factorcode.org/git/factor

Merge branch 'master' of git://factorcode.org/git/factor

* 'master' of git://factorcode.org/git/factor: (73 commits)
  Fix  ui.gadgets.scrollers unit tests
  Browser tool now saves scroll bar position in history
  Rename scroll word to set-scroll-position and make it public
  Rename scroll word to set-scroll-position and make it public
  Move models.history to extra
  Clear button in search field is now positioned correctly
  Fix prettyprint of CONSTANT: and ALIAS:
  Fix prettyprinting of URLs
  Fix alien unit tests
  Fixes for recent changes
  Fix mailbox-get-all, and make mailbox timeouts throw a wait-timeout error instead of a string
  Oops dead code
  Fixing this for Windows
  mason.test: check if boot image is out of date, and refuse to build if so
  Fix documentation for map-index
  Fix alien hashcode for expired aliens
  opengl.textures: pad image up to a power of 2 using glTexSubImage2D instead of doing it in Factor code
  Don't call glFlush, it's useless
  Simplify do-matrix
  Add hashcode method for simple-alien; improves performance of malloc and free
  ...