libhpcalcs: portable (Windows / MacOS X / Linux) connectivity kit library

[debrouxl]

* is the code built from the master branch, or from the master2 branch ?
* do screenshots (especially type 8, the largest one, which creates ~18-20 KB of data when the calculator is on the Apps screen) work ?
* could you use "tee" to write terminal output to both standard output and a file, then post / e-mail me the result ? I'm most interested in the dump of the first bytes when receiving a file, F7 01 xx xx xx xx <and then some more>.

Thanks in advance