Exception handling reform (part 1)
- implement ad_try based on (byte-compiled) Tcl try to make exception
handling more Tcl compliant
- Replace several "catch" operations in request-processor by ad_try
- de-spaghetti "rp_handler" and factor out "rp_handle_request"
- Provide error context in log message in a more uniform way
- handle ds stub-procs in a more uniform way:
provide as well a stub for "ds_init" instead of
wrapping it into a "catch" operation.
- move deprecated procs "ad_return" and "rp_handle_adp_request"
from request-processor-procs to deprecated-utilities-procs.tcl
- bump version number of acs-tcl to 5.10.0d2