[colm-users] dns.lm test working again AND test suite started

[Adrian Thurston]

The DNS test case is functional again. For a while, the token position 
information was not functional. This test case depended on that the 
extraction of the the byte-offset of tokens.

In order to ensure regressions to not take place, a test suite has been 
started, with dns.lm being the first case.

To run it go: cd test && ./runtests

There will be more tests added in the future.

-Adrian