new parser for MesoRAD database

[dirkseidensticker]

initial parser for the MesoRAD database.

ToDo's:

• [x] update the thesauri
• [x] update NEWS.md

[dirkseidensticker]

Noticed that the database neither has material nor country names, thus the thesauri are unaffected. In order to test readxl properly, I merged the master already and removed merge conflicts.

[nevrome]

Should be fine already :+1:

[dirkseidensticker]

concerning f4b56279ea3f35f0c09c7b874cd7708cb689fc34 : always got one failing test on my system without the protocol specified; see:

Not sure if that happend on your system as well. Now all tests pass:

Are you okay with that change?

[codecov-commenter]

Codecov Report

Merging #112 into master will decrease coverage by 0.54%. The diff coverage is 96.80%.

@@            Coverage Diff             @@
##           master     #112      +/-   ##
==========================================
- Coverage   95.51%   94.96%   -0.55%     
==========================================
  Files          33       34       +1     
  Lines        1626     1648      +22     
==========================================
+ Hits         1553     1565      +12     
- Misses         73       83      +10     

Impacted Files	Coverage Δ
R/c14_date_list_basic.R	90.14% <73.33%> (-5.18%)	:arrow_down:
R/c14_date_list_classify_material.R	90.47% <100.00%> (-1.53%)	:arrow_down:
R/get_14cpalaeolithic.R	100.00% <100.00%> (ø)
R/get_14sea.R	100.00% <100.00%> (ø)
R/get_c14data.R	77.27% <100.00%> (-10.42%)	:arrow_down:
R/get_calpal.R	100.00% <100.00%> (+1.75%)	:arrow_up:
R/get_eubar.R	100.00% <100.00%> (ø)
R/get_irdd.R	100.00% <100.00%> (ø)
R/get_mesorad.R	100.00% <100.00%> (ø)
R/helpers_thesauri.R	100.00% <100.00%> (ø)
... and 5 more

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