change PMM_* construction condition defines to an enum
Documentation
fix warning on implicit declaration of stat function
remove unused variables
fix compiler warnings
fix unused variable warnings
uninitialized warning
Condition is now an enum, check was useless anyway
refactor interval code from pmm_data.c to pmm_interval.c
fix some problems with libexec dir
refactor parameter related code to pmm_param.[ch]
add forgotten header to EXTRA_DIST
create pmm local state dir explicity on install

Autotools no longer creates directories for empty targets so need an
install hook and mkdir
add conditional muparser include
fix include typo
Fix some possible memory leaks

not freeing when error is returned
Remove duplicate branch
Misplaced bracket in condition with assignment