'click' python dependancy may be missing on some architectures

[blinard-BIOINFO]

When freshly installed on a server from source compilation, this error may be raised:

 $ ipk.py build -b $RAXMLNG_BIN -r $WORKDIR/output_model.raxml.reduce.fasta -t $WORKDIR/output_model.raxml.reduce.fasta.raxml.bestTree --ar-config $WORKDIR/model.json --workdir $WORKDIR --model GTR --threads 32 --use-unrooted

Traceback (most recent call last):

  File "/usr/local/bioinfo/src/IPK/IPK-v0.5.1/ipk.py", line 13, in <module>

    import click

ModuleNotFoundError: No module named 'click'

This will occur if click python module is not installed.
This problem will not appear with conda-based installation, as 'clisk' was set as a dependency in ipk recipe.

[blinard-BIOINFO]

I added instructions in the wiki via 9dc1430, however a better "long term" way to manage python from sources build should be found.