This reverts commit e118acf.

Changed CI for valmeta for forest plot, to prevent unnecessary error in test.

Split tests for oecalc into three. Note that this change highlights that the tests fail for Poisson Binomial OE ratio.

Split test for ccalc into three.

Automatic change due to test change

Changed plotting options, per new preferences in ggplot. This also removes warnings in the tests.

Added function for retrieving multiple functions, which metapred uses to find functions.

Changed tests such that manual testing is easier - automatic testing remains functional.

Fixed bug in metapred where multiple genFUN raised an error. Added parameter to allow for multiple options for handling multiple genFUN and perfFUN simultaneously. Changed gen so that multiple generalizability estimates can be retrieved simultaneously.

Added tests for multiple generalizability and performance functions in metapred. This should prevent the fixed bug from reoccuring.

Removed empty sections from Tzoulaki manual

added docs for applying multiple generalizability and performance measures simultaneously in metapred

Added tolerance to tests for oecalc

changed ci to t dist for test of valmeta oe

Added one-stage random effects for metapred, and tests

added option for perf() of metapred

added tests for one-stage models in metapred

fixed perf, which was failing a test for type of output

fixed test for one-stage random effects metapred