Update for Subversion conversion: 1. Fix comments for -usesvn and -svnurl options. 2. Fix default URL for SVN access. 3. Fix paths to accommodate "trunk" when checking out from SVN.
Update for Subversion conversion:
1. Fix comments for -usesvn and -svnurl options.
2. Fix default URL for SVN access.
3. Fix paths to accommodate "trunk" when checking out from SVN.


git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@37736 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx