@nogc for std.complex
std.path - more rangification
Fix issue 12747 std.regex bug in the parser allows reference to open groups.

Check the stack of opened constructs for groups when emit back-refs.
[CLEANUP] Remove old hack, CTFE is better these days
Merge pull request #2175 from DmitryOlshansky/cleanup-regex-1

[CLEANUP] Remove old hack, CTFE is better these days
Merge pull request #2169 from WalterBright/path-more-ranges

std.path - more range-ification
fix property enforcement
Merge pull request #2176 from 9rnsr/enforceProp

fix property enforcement
Remove trailing whitespaces
Merge pull request #2177 from monarchdodra/trailingWhite

Remove trailing whitespaces
convert jagged array with rectangular one
Merge pull request #2180 from WalterBright/rectangular-array

std.algorithm.Levenschtein: convert jagged array to rectangular one
annotate mathspecial functions
add annotations to biguint
Convert SysTime's examples to ddoc-ed unittests.
Merge pull request #2183 from jmdavis/datetime_ddoc_tests

Convert SysTime's examples to ddoc-ed unittests.
Merge pull request #2181 from WalterBright/annotate-math

annotate mathspecial functions
Merge pull request #2145 from WalterBright/nogc-complex

@nogc for std.complex
std.stdio: annotate C functions
std.conv: parse not handling some cases