Add parameter "flat" to gen_stitching_macro_code().
Move ijm-templates to "imcf_macros.jar".

Changes required in the following files:
- tools/FluoView_OIF_Stitcher.py: adjust template path and call to generate
  macro code accordingly
- macros/imcf_macros.lst: add templates to file list
- macros/Makefile: add templates to dependencies for .jar
- Makefile: remove "ijm_templates" directory
Add packaging information to readme.