1. If an input line ends in a backslash, remove the backslash

1. If an input line ends in a backslash, remove the backslash
and append the following line as a continuation.

2. Disable the readline library's special treatment of
horizontal tabs, which by default trigger file name
completion (which is not useful for srfsh).

3. In calls to strtok(): accept horizontal tabs as
delimiters, since they are no longer suppressed
by readline().

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1716 9efc2488-bf62-4759-914b-345cdb29e865