ntcpcalc.py

- command line python script that calculates the NTCP (Normal Tissue Complication Probability)
# if parameters feed to the script directly run script as:
# ./ntcpcalc.py 0 1 "dvh.txt" "Heart" shell
# and via single questions to the user:
# ./ntcpcalc.py userinp

output would be as follows:
NTCP=1.3%

finished:
- currently a number of different LKB (Lyman-Kutcher-Burman) model parameters and relative seriality models implemented
- reads in differential DVH (dose-volume-histogram in ASCII format)
- nine different LKB parameter sets for lung NTCP
- two different LKB parameter sets for heart NTCP
- three different relative-seriality-model parameter sets for lung NTCP
- four different relative-seriality-model parameter sets for heart NTCP

further to be implemented:
-easy processing of an unlimited number of dose-volume datasets
-implement plotting of dvh (comparing datasets and NTCP values) via matplotlib
-add further biological models for different organs (e.g.TCP)