Added namedGroups property to Regex struct.

Extended NamedGroupRange to be a random access and forward range, and added length memeber.

Changed name of namedGroups property to namedCaptures
Fixes Issue 10570
make cycle opDollar manifest constant
Better slicing for map

Specifically, slice to end and partial slicing for infinite ranges. Supports ulong indexing on x86 when (underlying range provides it).
Fix for issue# 10474.
Remove bug 9578 workaround

Because the compiler bug was fixed recently.

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Revert "Merge pull request #1178 from denis-sh/add-Issue-9578-workaround-to-`std.algorithm.all`"

This reverts commit 8dbfc1a7382792e039c8f1d7f5f5232279dead04, reversing
changes made to 93c724f2a36a798985dc1d82b050899455c8de4c.
Improve byLine doc

Move byLine examples from ByLine to byLine.
Fix LinesReader typo.
Explain that lines will not persist when using a mutable type for Char.
Document parameters.
Make byLine return an opaque type

File.ByLine is still visible for backwards compatibility, but no longer
documented.
Fix Issue 10607 - DirEntry has no constructor

http://d.puremagic.com/issues/show_bug.cgi?id=10607

Fixes:
auto a = DirEntry("path"); //Correctly works

Simplified code a little bit (Axed _init)

Improved FileException usage
Merge pull request #1385 from blackwhale/named-regex

Added namedGroups property to Regex struct.
Fixing some un-necessary calls to text. Fix comment.
s/forward range/input range/ plus minor fixes
Merge pull request #1408 from ntrel/byLine-doc

Improve byLine doc
Merge pull request #1406 from 9rnsr/remove9578wa

Remove bug 9578 workaround
Fix Issue 10621 - dirEntry is (now) useless
Fix typo in xformat doc
Merge pull request #1407 from monarchdodra/DirEntry

Fix DirEntry string construction and CopyContruction
Merge pull request #1401 from tom-tan/fix_generateLogger

Fix Issue 10570 - Example of `how` function for AutoImplement should work for non-abstract class
Merge pull request #1377 from jmdavis/10474

Fix for issue# 10474 -  takeExactly fails to propagate all relevant attributes
Merge pull request #1398 from monarchdodra/mapSlice

Better slicing for map