API for getting/setting RDII parameters

[sm-rana]

The API for getting/setting RDII parameters can be useful during the calibration or RTK values using measured flow/depth data.

[codecov-io]

Codecov Report

Merging #266 into develop will increase coverage by 2.52%.
The diff coverage is 88.23%.

@@             Coverage Diff             @@
##           develop     #266      +/-   ##
===========================================
+ Coverage    62.66%   65.19%   +2.52%     
===========================================
  Files           53       53              
  Lines        16718    16786      +68     
===========================================
+ Hits         10477    10944     +467     
+ Misses        6241     5842     -399

Impacted Files	Coverage Δ
src/toolkitAPI.c	67.75% <88.23%> (+1.3%)	⬆️
src/massbal.c	79.02% <0%> (+0.21%)	⬆️
src/input.c	74.14% <0%> (+1.7%)	⬆️
src/swmm5.c	86.97% <0%> (+1.86%)	⬆️
src/node.c	59.27% <0%> (+1.91%)	⬆️
src/gage.c	64.91% <0%> (+2.19%)	⬆️
src/report.c	84.09% <0%> (+2.2%)	⬆️
src/routing.c	68.21% <0%> (+2.31%)	⬆️
src/datetime.c	75.56% <0%> (+2.84%)	⬆️
src/inflow.c	80.2% <0%> (+4.16%)	⬆️
... and 1 more

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[bemcdonnell]

@sm-rana, can you fill out the Contributors License Agreement? CLAHUB

[bemcdonnell]

@sm-rana I'm going to start working on this PR again :)

[bemcdonnell]

@sm-rana it is also apparent to me that you were PR +900,000 lines of changes!!!! You're trying to break a world record!