use of onionR in order to create environment for each process
model has now an onion structure where every process is embedded in the environment of its parent
a ddd object enables the processing in between every process without any problem of interaction within variables
this way of structuring the model simplify the writing of the package: time, obs, param, model, init, simulation
new [so far very simple] obs-modules are incorporated (precip, temperature, runoff, snow coverage). This is a start for an easy connection of ddd with the different observations
ddd 0.0.2
add a do.simTSv2 function in order NVE to test ddd with its precipitation and temperature fields
homogeneization of the name of the functions
update the code according to the homogeneized function names of the related packages
MAD is now taken as a parameter
ddd 0.0.1
Added a NEWS.md file to track changes to the package.