fixed 3 issues

[ghost]

After trying to install and run Pombo, i discovered some issues which are fixed in this PR.
Note: ubuntu 18.04 python 3.8.0

1 - install.sh and uninstall.sh scripts for linux uses #!/bin/sh -e
running the shell script with -e option abort script at first error. If some dependancies are missing, the error code 0 is generated by test=$(which ${package}) and the script is immediatly stopped without any information about the missing package
proposal : install.sh and uninstall.sh scripts must uses #!/bin/sh

2 - in install.sh command ‘python check-imports.py’ is not working: wrong path given
proposal : compute variable ${src_dir} corresponding to pombo main dir, uses this ${src_dir} everywhere it is needed
${src_dir}/tools/check-imports.py

3 - Which python version is used ??
Using multiple versions for python2 as well as for python3 on a system (this was the case for me) may lead to confusion (for which python version a missing package should be installed?). In some case, the shell script can use a different version then the terminal command.
Proposal : install script now display python version used by install.sh (version which will be used by all shell scripts)

4 - Webcam shot using streamer under Ubuntu 18.04 issue
Using option ‘-w 3’ on my computer always give a dark image (it seems webcam don’t have enough time to adjust brightness). Is this bug related to my config ? I didnt’t found any reference nor correction to this issue. Replacing ‘w 3’ with ‘-t 1 r 2’ (take 1 frame, 2 frames per second) corrects this. Corresponding options have been added for Linux in pombo.conf

; [L] /usr/bin/streamer -q -t 1 -r 2 -o
; [L] /usr/bin/streamer -q -t 1 -r 2 -j 100 -s 640x480 -o

5 - Pombo.py don’t generate the .gpg crypted file
Pombo.py  line 702: in generating gpg crypted file (-o) and [files] (after -e ie input file) arguments where exchanged.

[BoboTiG]

Wow thanks a lot! :)

[BoboTiG]

And this is why we need to tackle #33: it would have catched your point n°5.