Standardize ret var, end:, and help return status.

Always use "ret" as the return code from the commands. Always use "goto
end" as the way to exit xxx_main (don't think I missed any).
The "use -h for help" always returns 1.
The "--help" option always returns 0.
Add missing files to "make tags" target and E_SRC variable.
Change prompt to "openssl :" and skip the colon on the command-line;
makes cut-and-paste easier.
Merge branch 'rsalz-monolith' of github.com:akamai/openssl into rsalz-monolith