implemented sort function using qsort_r
implemented functions to free allocated task data
object specific rules in makefile
function to count number of tasks in a task array
created basic task display in ncurses
doxygen documentation of cursutil.h
include cursutil in tasklist.c
doxygen documentation of json.h, sort.h, task.h, and tasklist.h
added doxygen configuration file
add makefile target to run doxygen
added function to set curses input mode
add doxygen todo to sort.h to add more sort modes
document enum with doxygen