[12gevmoller_sim] [JeffersonLab/remoll] 482588: Change the default build type to RelWithDebInfo

[Wouter Deconinck]

  Branch: refs/heads/bugfix-default-build-type-relwithdebinfo
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  Commit: 482588c367795363a6d257f8e7bdcb57f1fac747
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  Author: Wouter Deconinck <wdconinc at gmail.com>
  Date:   2019-04-02 (Tue, 02 Apr 2019)

  Changed paths:
    M .gitignore
    M cmake/modules/BuildType.cmake

  Log Message:
  -----------
  Change the default build type to RelWithDebInfo

The default build type was Debug, which is about ~30% slower than
RelWithDebInfo, and RelWithDebInfo contains the same backtrace info.
This will make code faster (since typically run without changing the
default build type).

A specific build type can be chosen without the neeed to specify a
command line flag by creating a file .buildtype (which is ignored by
git) with as content e.g. Debug. This will persist between deletes
of the build directory (but changing the file will not cause a new
build type to take effect, this is only read on the first call to
cmake in an empty directory). The content of the file can still be
overriden with a command line argument.