Modify gtest/gmock tests to work around demented test implementation in Debian
Fixed kvp-value delete

Delete wasn't being called properly due to bad template resolution.
Implement KvpFrame in C++ using std::vector

KvpFrame was implemented using GList. Given the current desire
to distance ourselves from glib and acquaint the project with
C++, the standard library thereof, and boost libraries, KvpFrame
has been replaced by an implementation that uses a std::map<
const char *, KvpValueImpl *>.

There were some cases of the KvpFrame's glist being accessed
directly. A new API to help callers access the KvpFrame's contents
systematically by providing a list of keys has been created, and
call sites of the GList code have been updated.

Another deprecated #define was found and removed (kvp_frame_set_str).
Update CMakeLists after recent file addition
Build glib gtester based tests under check_PROGRAMS, run under TESTS

Instead of TEST_PROGS. This has two advantages:
* By deferring the builds until make check any prerequisites, especially
in test-core, are already built regardless of overall build order.
* The output of these tests is logged and the success or failure
included in the make check summary instead of adding their rather verbose
output to the stderr.
Fix stray left-over line which prevented most of the engine tests from running.
Added quotes to gtest section in configure.ac

Without these quotes, the error messages can be confusing in the case that
variables contain spaces, and, more likely, when the variables are empty.
More realistic get_random_gnc_numeric()

Increases the possible denominators to 1E10, but clamps the numerator to
1E13 * denom with 1E19 max. This is equivalent to $1E8/1 US in
Indonesian Rupiah, the currency with the lowest per-unit value in the
world at the time of this commit.
Begin QofInt128 class.

Constructs, adds & subtracts, prints, and compares.

Includes unit tests.