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rip out formula parsing and replace it with something sane (#54)

Major internal changes to how formula expressions are parsed.  The visible changes are that 

1. the formula expression is processed according to the DSL _at parse time_ (e.g., in the `@formula` macro) instead of at run-time
2. the `Formula` struct holds the `lhs` and `rhs` sub-expressions, but also holds the original (un-parsed) expression in the `ex_orig` field, and the parsed expression (i.e., a `:call` to `~`) in the `ex` field.

These should only affect users that actually rely on the internals of the formula struct or construct them manually.

Internally, the parsing code has been completely re-written to use rewrites rules with a uniform API.

* drop in new parsing code

* use typemax(Int) instead of Inf

* fix onesided formulae

* more tests are broken

* guess debug macro isn't exported

* get rid of debugging code

* using argcheck in formula: cut the crap and indent

* forgot a Compat.findfirst

* remove argcheck dependency

* updating tests

some have been fixed by this PR, some have been broken (but maintain
functionality so passing versions have been added alongside).

* actually just use Terms to get functional version of formula

* rewrite rule for interactions with number terms

* make revise-friendly, deleteat ex.args, missing ||

* typo

* docstrings for new rewrites and update tests

* remove dead code

* add (deprecated) 2-arg Formula constructor, and tests

* use different warning tests depending on the version

* use @ static for version check

* check version against 0.7.0-DEV.2988

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