egm08 col name adapted - unit error fix

Update RFunction.R

2nd col of egm08, this commit didnt get through from new laptop... strange

add units package

v3.5

add units package into appspec

fix units erros if msl height

v3.4

fix units errors if msl heights

fix extract error within elevatr

v3.3

fix extract error within elevatr

fix input for extract()

v3.2

fix input for extract()

add egm local file path

v3.1

Merge branch 'main' of https://github.com/movestore/Add_Elevation

update to move2 with improvements

Merge pull request #9 from movestore/andreakoelzsch-patch-1

Update appspec.json

update input type for elevatr (spatial points)

v2.2

Update RFunction.R

adapt timelag class

v2.1

adapt timelag class

add geoid heights and possibility to adapt ellipsoid height with them

v2.0

update for large file aux