• for some reason we can not initialize a vector from a simple array. It should be possible but it won't compile on native windows. So to work around it we just do a memcpy.

• Two places where we can reduce the scope where we hold this lock.

bump sqlite and boost versions (when building libnexa), use curl instead of wget to access files because curl is by default in ubuntu, update one cashlib->libnexa doc, use rostrum latest (daily dev)

This MR adds add two templates that allow people to easily use the python test framework to access mainnet (or testnet). Its is really useful to be able to quickly write a python script to gather info about mainnet/testnet.

These programs aren't tests, so putting them in the rpc-tests directory is not great. However, until we isolate the python code into its own library, "rpc-tests" is the ONLY place this code can be run from, because test_framework must be a subdirectory of the location of these files.

I think its better that they be in rpc-tests, and be available to anyone to use, rather than remain in my personal stash of useful tools.