Explicitly cast "char" to "unsigned char" when assigned to "int" to prevent sign extension from breaking comparions against EOF or passing invalid arguments to ctype functions.

Original commit message by deraadt: (unsigned) means (unsigned int) which on ptrdiff_t or size_t or other larger types really is a range reduction... Almost any cast to (unsigned) is a bug.

ok stsp

Feature requested by naddy. ok naddy, who also suggested some tweaks that will arrive shortly

yacc has been complaining about "shift/reduce conflicts" since commit 16c4be8c1cab9456f9dd0468c27f8ab73235737e Revert that change for now. Not sure how it can be done properly. In any case, allowing empty config blocks is not very important.

This is the beginning of support for naddy's suggestion to break this out similar to git. More code to come from stsp. ok stsp@

Make use of this in 'got clone' to persist -R option arguments given on the command line in the cloned repository's got.conf(5) file.