Seed menu now optional (#55)

To allow backwards compatibility with v1.2.0 input files, the seed
menu is now optional. If not present in the input file, a random
seed will be assigned as usual.

Fixed two bugs and increased debug info (#50)

Two bugs were identified and fixed. First, a loop over altitudes could
be entered in a way which would never terminate; it's not actually clear
why this was not always happening. Second, a variable was being allocated
too little memory by one (lapseInit_), resulting in memory corruption.
The debugger compile flags used when -DCMAKE_BUILD_TYPE=Debug is
selected have also been pared down (removing -gdwarf-2 and gstrict-dwarf)
so that more advanced debugging can be performed.

Co-authored-by: Sebastian D Eastham <seastham@hurricane.ae.ic.ac.uk>

APCEMM v1.1.0 release.