Several improvements to lb-format

based on user feedback, I made several improvements to lb-format (apart from minor improvements/fixes)

• try to ensure that a .clang-format file is present
  • if not found try to create it in the topdir of the git project, if any
• added mode to format all formattable files (both for --format-patch or in-place reformatting)
• added a --dry-run option to just show which files would be modified
• modified --format-patch to produce the patch file without modifying any file
• support stdout as --format-patch destination
• added --pipe mode to format from stdin to stdout

CC: @jonrob

added 2 commits

• 69a02691 - Factored out functions to locate clang-format and yapf
• 95d18583 - Add lb-clang-format "alias"

Compare with previous version

@jonrob, as discussed in private mails, I added the lb-clang-format alias, which internally uses the same lookup code of lb-format (refactored more or less as you did).

In principle there would not be a need for the wrapper for yapf, but having it would help making sure we use the right version... may be done later.

mentioned in commit 3d3bef0f

merged

changed milestone to %0.4.4

added Addition Fix labels