Patch from Scott McKellar to remove srfsh.h and push all relevant

Patch from Scott McKellar to remove srfsh.h and push all relevant
delarations into the implementation file, with some additional cleanup
to remove "declared by not used" warnings:

1. We have no further use for the header file.  Accordingly I
include a patch to the Makefile, removing a dependency on the header.

2. I declared as static everything that was formerly in the header,
plus a few variables that were already defined in srfsh.c.

3. I commented out the shell_reader variable, since it is no longer
used.

4. I commented out two of the lines printed by the help command.
These lines refer to the "time" command, which srfsh no longer
supports.

5. I commented out the prototype for the handle_time function, since
the function itself is already commented out.

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1018 9efc2488-bf62-4759-914b-345cdb29e865