fix examples

fix more short-names

Update README.md

shorter names for function signatures are in the works

Added a GUC for country code setting

A GUC variable 'spock.country' and spock.get_country() function are
added to set and retrieve the country code.

Fix one off index for parameter in ..._remove_table()

The new parameter include_partitions is on index 2.

Exclude BOOL from DCA for now.

We cannot prevent a local transaction from changing
the value back to false, and that change then won't
propagate.

Protect CTT pruning with cth_lock

Protecting the CTT pruning with the cth_lock
prevents ERROR messages 'tuple concurrently deleted',
which terminated the apply worker during catch-up
frequently.

Merge branch 'delta_apply'

renamed counter statis views to:

 - get_channel_summary_stats
 - get_channel_table_stats

fixed get_channel_summary_stats view to display stats based on channel
instead of node.