Fix test_symlinks.js failure on Mac OS X, match UNIX native target code (use readlink, not realpath). b=516799 r=bsmedberg

[OS/2] Bug 512504 - don't link against external libs that are stubs when the real function is in libc, r=pweilbacher

[OS/2] Bug 516117 - fix problem with GetFromTypeAndExtension() so that handlers get listed in Tools->Options->Applications, r=pweilbacher

Bug 494165 - Support --total-chunks, --this-chunk, --chunk-by-dir, and --shuffle arguments to runtests.py. r=ted

Bug 471054 - Prune old crash reports in pending/, splitting code into crashreporter_win and crashreporter_unix files, r=ted

Bug 485409 - Handle a Windows-style path as $srcdir in configure, by modifying the default autoconf M4 macros so that they recognize Z:/ as an absolute path. r=ted

Bug 511771 - Provide a way for Web content to preview and install lightweight themes. r=mconnor, sr=vlad

Bug 517802 - Use a new API on 10.5 that lets us scroll dirty rects instead of always invalidating the whole view when scrolling a dirty view. r=josh

Bug 471245: Unpacked extensions inadvertently enable plugins when reading chrome file at startup. r+sr=jst

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extra : rebase_source : 553bdb02ffe00b0a94ebdb0227aaf8cf56f9841d

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extra : rebase_source : 3586c78584b1ed73168ef0e7361b6e46305f43d6

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extra : rebase_source : de46fdadcefed1fd203a824ed4b078c7ba0b6779

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extra : rebase_source : c494f75bd7cc1cf4b114b9ff497412fb1e3c1ce1

Bug 506061 - Deal with audio XRUNs as soon as possible.  Also clean up the code a little.  p=j^, r=chris.double

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extra : rebase_source : ffbff463b77ade2bacc5a8b9f662228b05667dc3

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extra : rebase_source : a07687f16726086dd425eef8907788019beebbe1

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extra : rebase_source : e72005a765db36ed9b4cdd7d8717f6f923ce6b67

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extra : rebase_source : d2b18e88ddec3836e30b448f949657206a33f3fa

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extra : rebase_source : 21a045016d300e77fb234d0cbacbfd3bfd25484b

Bug 495228, followup patch: Remove a few trailing right-paren characters that were missed in this bug's previous landing (to fix build warnings like "Extraneous text after ifneq directive"). r=ted

bug 516396 and bug 515064.