Release 0.1.3: add prependfile and appendfile commands to support file includes.

rxedit v0.1.3 release.

• added commands appendfile / prependfile which include a file's contents at the insertion point

• added command line flag -R, --report-file: write only visibles to file.

• added command line flag --no-empty-write: don't write outputs with -o, -O or -R flags if empty