[PATCH] Implemented tab usage only for indentation (http://llvm.org/PR17363)

[Alexander Kornienko]

Hi klimek, djasper,

Changed UseTab to be a enum with three options: Never, Always,
ForIndentation (true/false are still supported when reading .clang-format).
IndentLevel should currently be propagated correctly for all tokens, except for
block comments. Please take a look at the general idea before I start dealing
with block comments.

http://llvm-reviews.chandlerc.com/D1770

Files:
  include/clang/Format/Format.h
  lib/Format/BreakableToken.cpp
  lib/Format/ContinuationIndenter.cpp
  lib/Format/Format.cpp
  lib/Format/WhitespaceManager.cpp
  lib/Format/WhitespaceManager.h
  unittests/Format/FormatTest.cpp
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