Basic profiling of the code.

It can be seen that most of the (current) time is beeing spent
during the pyvo and astropy modules importing and on the copy of
the retrived result; in addition to the well accepted time spent
on retriving the remote (TAP) service.
Reorganized the code motivated by the time profiling procedure.

Current code has the main pieces of time consuming being tracked;
Next commit should remove those lines.
Profile done (still) with the Time object. Code to be clean and finish profiling.
Adjustments done to the conesearch output, to better inform whether it has found something or not.