Log Message:
tex-polyglossia{,-doc}: update to 1.66

1.64
Fix conflict of soul with splithyphens on XeLaTeX (regression in some languages)

1.65
Bug fixes
* Fix spurious space in Hebrew captions.
* Fix resetting of language specifications at end of inline switch.

Documentation improvements
* Refer to \greeknumeral and \Greeknumeral rather than to the synonyms
  \greeknumber and \Greeknumber.

1.66
Bug fixes
‣ Fix OpenType language and script tags in Chinese.
‣ Fix resetting of language specifications at the end of a local font set with
  babel legacy means (\foreignlanguage or otherlanguage* environment).
‣ Fix lowercasing of \textlang’s first mandatory argument. Now the casing does
  not change (language tag was lower-cased always).
‣ Add missing BCP-47 alias for Khmer.
‣ Stop \charifavailable from looking ahead for more numbers or gobbling a space.

New Features
‣ Add support for Odia, provided by AviseK Jena and AshoK Das.
‣ New auxiliary package odiadigits
‣ Add auxiliary command \IfCharIsAvailableTF to complement \charifavailable.