added "s" as valid switch for seconds.
if no time unit switch is set the program will expect seconds as well

changed Makefile to clean up before build and remove
objectfiles after compilation and link process

Signed-off-by: Stefan Venz <ikstream86@gmail.com>
added tool tip for s,ms,us time units

Signed-off-by: Stefan Venz <ikstream86@gmail.com>
removed another TODO from input.c
and changed pkg-config for building the gui

Signed-off-by: Stefan Venz <ikstream86@gmail.com>
made minor modification in Makefile and control.c

Signed-off-by: Stefan Venz <ikstream86@gmail.com>
Merge branch 'next-sv'

This merge brings new features and bugfixes from next-sv to master
which have been tested now