Revert "Added 'italian_name_separator' test into test9 of the testing suite."

This reverts commit 02a3c53b9b3df80fb84cd1722bc5b3bbb651049d.
Merge branch 'master' of https://github.com/nzhagen/bibulous
Added 'italian_name_separator' to test9.
Updated 'guidelines' doc to include new operators.
Modified test9 in testing suite to include 'italian_name_separator'.
Major changes to get_indexed_variable() so that dot characters are allowed inside operator arguments.
Added checks for OS in setting locales for test4 and test7 of testing suite.
Added 'substr_replace' test to test1 of testing suite.
Renamed operator '.substr_replace()' to '.replace()'.