make lightyear track position information.

[jfdm]

• Added tracking of parser state to include positioning information.
• Updated error message output using new state.
• Deprecated old error messages.

[jfdm]

So one of the tests is failing for some reason. I'll investigate later, so will close and reopen once fixed.

FYI, its "Test 7" in Tests.idr. The test is failing on the left alternative and is not taking the right one, and I cannot work out why.