Unused param elements

Change-Id: Iaefcd143eea3a09040cc0b6aa5d07b2d131e525c
sw: improve doc model xml dump of SwFmtAnchor

Change-Id: Icdfc370c4b525fd43d9d5935ff461534cf535233
DOCX import: tokenize CT_SdtDate / storeMappedDataAs and calendar

Change-Id: I7d47e7db08637488975b834f7cc72fe1251a14d3
DOCX import: handle date SDT in headers/footers

Turns out form controls are not allowed in headers/footers (see the
comment in the patch), so if that happens, then just fall back to what
we already do for other SDT types.

Change-Id: Icc79c2a825e9eb2a85980489812a4178fde37576