Update many references in docs, scripts, etc to "svn".

* In documentation, I substituted a lot of instances of svn with git, reworded
  some things to make them scm agnostic, and updated example svn commands with
  equivalent git commands.
* In scripts that use find from the root of the repo and were filtering .svn, I
  added .git to the filter expression. We only need to worry about filtering
  .git from the root. Unlike subversion, git only creates a single .git
  directory at the root of the repo (subversion started doing this in version
  1.7 and later). I left the .svn filters in for now. They don't do any harm
  and it would be confusing/annoying/irritating to remove them before we stop
  using subversion.
* I updated a few scripts that were using svn commands to do things to use
  equivalent git commands. Nothing mainstream was been changed (namely nightly
  still uses svn to manage perf data).
* I added a few FIXMEs to scripts that should have their svn commands converted
  to git at a later date.

git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@23792 3a8e244f-b0f2-452b-bcba-4c88e055c3ca
Initialize two local variables to avoid a Clang error


A recent checkin to qio/qio_channel_print_complex() caused compilation to
fail in developer mode with clang.  Error was that two local variables
were uninitialized but could be used along an error handling path.

Initialized the offending variables (the components of a complex number)
to 0.0.


Compiles: Clang on STD
Tested:   None
Reviewed: None




git-svn-id: http://svn.code.sf.net/p/chapel/code/trunk@23793 3a8e244f-b0f2-452b-bcba-4c88e055c3ca