Add support for file logging to ctkErrorLogModel
Add support for error log context
ENH: Re-introduce and expose number of logs to keep
Fix configure error relayed to missing ctkQtTesting cmake module
Fix CMake 3.0 configure error when building CTK with testing enabled
Merge branch 'fix-misc-configure-errors'

* fix-misc-configure-errors:
  Fix CMake 3.0 configure error when building CTK with testing enabled
  Fix configure error relayed to missing ctkQtTesting cmake module
Merge branch 'error-log-model-to-file'

* error-log-model-to-file:
  ENH: Re-introduce and expose number of logs to keep
  Add support for error log context
  Add support for file logging to ctkErrorLogModel