[xep-support] Support of special types of spaces

[Jan Tosovsky]

Typography knows several types of spaces, each for different purpose. Xep
supports standard or non breaking space today only. Other spaces are
ignored, replaced by standard space or unknown char is used instead. I don't
know how widely such feature is supported by other FO processors (I do not
use them), but it would be nice.
Next entities were taken from DocBook DTD (iso-pub.ent):
<!ENTITY emsp	"&#x2003;"> <!-- EM SPACE -->
<!ENTITY ensp	"&#x2002;"> <!-- EN SPACE -->
<!ENTITY emsp13	"&#x2004;"> <!-- THREE-PER-EM SPACE -->
<!ENTITY emsp14	"&#x2005;"> <!-- FOUR-PER-EM SPACE -->
<!ENTITY numsp	"&#x2007;"> <!-- FIGURE SPACE -->
<!ENTITY puncsp	"&#x2008;"> <!-- PUNCTUATION SPACE -->
<!ENTITY thinsp	"&#x2009;"> <!-- THIN SPACE -->
<!ENTITY hairsp	"&#x200A;"> <!-- HAIR SPACE -->

Jan

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