Early version of the patch OK'd by martin@.

Fixes #1855.

vbit_init now initializes a vbitmap from an arbitrary memory extent.
If more bits are used than the extent provided, auto-sizing falls
back to malloc, so vbit_destroy() should still be used.

adding a test program

Avoid some of the mess in src/ when building multiple vmods
in the same git tree.

When setting bit n (the n+1th bit) of an n-bit vbitmap, we'd miss to
expand the bitmap and thus overflow our buffer and overwrite the first
bit of the next byte in memory.

Without this we could start running ban_lurker_test_ban with an empty
list of bans to test, causing a lot of unnecessary ban and oh mutex
contention on every ban lurker invocation until the REQ ban triggering
it is gone.

Also don't call ban_lurker_test_ban when our destination ban is the
same as the one being tested. This would be wasted work.

Adjust the c00049.vtc test case for the bans now not being
unnecessarily tested.

Resetting the pointer would race against the ban lurker moving the OC
in the ban list and any object event listeners wanting to see the new
ban timestamp on OEV_BANCHG.

Fixes: #1863

Without this we could ban an object erranously if the ban lurker has
moved the OC in the ban list while we were evaluating.

Previously we would force the protocol and method fields to HTTP/1.1 and
GET, respectively, but hide this from VSL showing 2 different entries
for BereqProtocol and/or BereqMethod.

Discussed with arianna@.

Fixes #1662

This was forgotten in ecbdb32a and made the change moot.

Spotted by:	Martin

ban-list if the lurker washes this OC while we check it.

Mostly diagnosed by:	Martin

Fixes:	#1864

Both contents and formatting were off.

the refcount adjecent to the call.

Rename ObjStable() to ObjBocDone() which is more precise.

Fixes:	#1860

XML constructs ("</!--" and "</!CDATA[[" from confusing it.

barely concealed evil grin.

starts.

VRT_MINOR_VERSION needs to be incremented for the 4.1 branch.