[orber] Add possibilty to configure orber to run in both IPv4 and IPv6
[orber] Remove a define of ORBVSN when compiling orbers erlang modules
[orber] Remove unused file corba_request.erl
[orber] Update testcases and fixed some minor faults
[orber] Update documentation and fix testcase for IPv4/IPv6
Include the cause when raising a new IOException
Fix minor grammatical errors in epmd docs

Small grammar changes.
Rewrite agent configuration parsing
wip
Merge branch 'garret-smith/gs-jinterface-exceptions' into maint

OTP-12075

* garret-smith/gs-jinterface-exceptions:
  Include the cause when raising a new IOException
fix xml file merge messup
wip-all-regression-tests-but-one-manager
wip
wip: Rewrite manager net_if process
wip: passes all regression tests
Rewrite agent to use {Domain,Address} tuples as far as possible
snmp: Add IPV6 tests
fix agent configuration details
Go back to passing (Domain, Addr) to net_if filters
Bugfix: argument order to internal function verify_lines/4