debugger_sw/linux/timer.c: Period between interrupts is now directly updated
from the user vaule. Note that this period is always an integer number of
seconds (both in Linux kernel and here in stand-alone)

debugger_sw/fmc-delay/fd_stand_alone_main.c: Some unnecessary stuff removed.
Although Irq routine is short, is better to perform peridic updates outside
the irq routine as the temp. sensor require a conversion time.
Signed-off-by: Jose Jimenez <ppjm@correo.ugr.es>