libecap v0.2.0 options support: accept/update/log eCAP transaction meta-info

libecap v0.2.0 options support: accept/update/log eCAP transaction meta-info

Adapter transaction options are now extracted and can be logged in HTTP
transaction log (access.log): Moved ICAP-specific logging-related adaptation
history features to the general adaptation history class and used them in eCAP
code.

Support adaptation_masterx_shared_names option for eCAP transactions. eCAP
transactions can now forward meta information to subsequent ICAP or eCAP
transactions (within the same master transaction scope).

Allow a routing eCAP service to determine the list of adaptation services to
be applied next to the same master transaction (same as the X-Next-Services
ICAP extension).

Identified a couple of %adapt::<last_h logging bugs and history maintenance
inconsistencies but left them alone for now.