Relax ordering constraints for $-variable ModuleOptions

[tueda]

Here is a minimal implementation that relaxes the ordering constraints between $-variable-related ModuleOption statements (sum, maximum, minimum and local options) and other statements.

Previous discussions: #296, #188.

[coveralls]

coverage: 53.399% (+0.05%) from 53.353%
when pulling 7bffd7f on tueda:pr/allow-dollar-moduleoption-anywhere
into 4341c63 on form-dev:master.

[tueda]

The "Illegal information in number of arguments properties" is now correctly ignored (non-fatal):

CF f>=x<=x;
.end

[tueda]

The other various ModuleOption issues will be addressed in separate PRs (possibly for v5.0.1).