gmtstrainplot python verion error about straintool HOT 2 CLOSED

Tried to fix this via computing all quantities with bc, but that is probably not an option. Python does complicated manipulations (like print(round(${T},-1)+10)); this is not possible with bc (at least not in less than a few lines).

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Trying a new approach:

1. add a function in the script, to resolve system's python version (resolve_py_version())
2. make a function alias to python; this is called pythonc. If the system Python version is 3.x.x, then
   this function just collapses to alias pythonc="python -c". Else, if the version is 2.x.x, then the alias is
   python -c "from __future__ import print_function;.

Hence, now

1. When calling Python's print in the script, always use Python 3.x.x syntax
2. Instead of writing

python -c "print int((${south} + ${north})/2)"

we write

pythonc "print(int((${south} + ${north})/2))"

remember that is python 3.x print is a function, hence it must have parenthesis, print 5 is invalid, print(5) is ok!
Also, never use the piped version, aka echo print ${south} + ${tmp_scrate} | python

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