combine and interleave symbols added to definitions in any_content module

partial implementation of Issue #20

Signed-off-by: greenTara <taraathan@gmail.com>
schema associations changed to all local in test suites

Signed-off-by: greenTara <taraathan@gmail.com>
schema associations changed to all external in exa directory

Signed-off-by: greenTara <taraathan@gmail.com>
'default' value of "copy" included in content model of @per on <Rel> in dr-all module

Signed-off-by: greenTara <taraathan@gmail.com>
reorganized init module to group alias initializations together, for later modification

Signed-off-by: greenTara <taraathan@gmail.com>
horn log and hornlogeq examples copied from exa into test suite for local validation

Signed-off-by: greenTara <taraathan@gmail.com>
ignoring instance files (auto-generated) as these are regenerated randomly

Signed-off-by: greenTara <taraathan@gmail.com>