Added ==smoke-test support and ciftest command. Commands can now define a "==smoke-test" section in their CIF files, which defines a snippet of fshell script that will be run as part of "fshell smoketest" or by invoking ciftest directly. See the ciftest documentation for more details. Added ==smoke-test sections to a few commands, the ones that were easy to test!

---------------------------- Test U1 ------------------------------
1:X one
2:X two3:X three4:X four
5:X five
6:X six
7:X seven…8:X eight
9:X nine
10:X ten
---------------------------- Test U2 ------------------------------
12-Before 111
13-Before 222
14-Before 333…15:Match
16-After 111
17-After 222
18-After 333