Adds caching support in cdo_execute() and
cdo_execute_list() as well as cache management with
cdo_cache_set() and
cdo_cache_unset().
Global options are now not replaced by default if an
options argument is supplied. The new
options_replace controls this behaviour. If it’s
FALSE, then global options, operation options and argument
options are all concatenated (duplicated options are not checked for).
If it’s TRUE, then only the argument options are used, even
if they are NULL (which implies, no options). This is
potentially a breaking change.
cdo_options_use() will use
options for an operation. cdo_option_set() will set global
options to use for all operations. cdo_options_clear() will
clear the global options.cdo_operator() allows the user to define an
arbitrary operator in case the some operator is missing in the package.
Operators are run with the cdo() function.cdo_execute_list() to execute a list of cdo
operations. This is the preferred way of applying operations to a set of
files since it preserves ephemeral files correctly.