Changes to use alanka as a library

Added Display call to bison.y cm.cu and cm.h
Display call row.c as a modular callback.
Added execute_file(), alenkaInit(), alenkaExecute() and AlenkaClose() to bison.y

Main.cu is an example main routine and provides the existing functionality of Alenka via the 'execute_file' library call.  It requires alenka.h

Note: execute_file() represents the previous main() call in bison.y
Alternately, a main routine could use alenkaInit(), alenkaExecute() and AlenkaClose() to execute alenka instructions.
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