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gnocl::entry validation

Making headway now in implementing entry validation. As is always the case, the challenges don't arise from getting the code to work, but overcoming those instances when, theoretically, a block of code should work but doesn't. The most annoying aspect of all this is that such hindrances tyically occur in the simplest, most straight forward of tasks and those features which at first glance look daunting are implemented in a blink! Think I'm having a deja vu moment here.

Ah, such is life. Zen and the the art of C programming -- frustration arises when one's vision of an ideal and perfect world are shot to pieces by an abrupt clash with the imperfect reality of things.

The entry and parseoptions C modules now have all the necessary functionality coded into it, what now remains is to tidy it up, test and document it.

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