Small fixes.
Fixed #help directive.
Renamed pos variables to loc.
Improved makefile.

I added rules to generate both brazil and tt.
Since I assume brazil is where development will
next take place, I made brazil.byte the default
target. I also used .byte instead of .native
because we want faster compilation rather
than execution.
Added ocamlbuild targets to .PHONY

Since these targets have no dependencies, make
compiles each one only once.
By adding them to .PHONY, it always invokes
ocamlbuild, which then know what needs to be done.
Merge pull request #8 from matijapretnar/brazil-standalone

Various small fixes