apolloLogWrites an entry to the apolloLog, which lives inside apollo_inputs.
apollo_addLog(title = "", content = "", apolloLog, book = 1)Character. Title of the log entry.
Content of the log entry. Can be a single element or a list.
Each element will be converted to character using print,
and concatenated with a line feed in between.
Environment. It contains the character vectors of titles and content.
Positive scalar integer. Book number inside the log (default is 1).
TRUE if writing was succesful, FALSE if not.
The variable apolloLog is an environment created inside apollo_inputs
by apollo_validateInputs, but re-set by apollo_estimate.
As an environment, it can be modified in place, i.e. all changes done within this
function are recorded in apolloLog, even if it belongs to another environment.