Pike.identify_cycle: reset mc_ref_from to match asserts in f_count_memory.
Testsuite: Fixed broken lower_case tests.

It seems the Unicode tables were misread when they were updated,
causing eights in the table where there was supposed to be zeroes.
ci_tests: Use variables instead of array indices.

Fixes the support for LONGUPPERDELTA (which caused the broken
lower_case tests).

Cleans up the code somewhat.
Fixed warnings.
Good enough...
Use the ASN1 factory in LDAP