Moving several font related tests and several positioning related
tests into their better, more appropriate fonts/ and
positioning/ folders. I moved their associated reference
files too to their appropriate folders and possibly had
to edit accordingly their linkage.

--HG--
rename : css21/reference/font-051-ref.xht => css21/fonts/font-051-ref.xht
rename : css21/font-051.xht => css21/fonts/font-051.xht
rename : css21/font-052.xht => css21/fonts/font-052.xht
rename : css21/reference/font-family-rule-002a-ref.xht => css21/fonts/font-family-rule-002a-ref.xht
rename : css21/font-family-rule-002a.xht => css21/fonts/font-family-rule-002a.xht
rename : css21/font-family-rule-004a.xht => css21/fonts/font-family-rule-004a.xht
rename : css21/font-size-124.xht => css21/fonts/font-size-124.xht
rename : css21/reference/absolute-non-replaced-width-025-ref.xht => css21/positioning/absolute-non-replaced-width-025-ref.xht
rename : css21/absolute-non-replaced-width-025.xht => css21/positioning/absolute-non-replaced-width-025.xht
rename : css21/reference/absolute-non-replaced-width-026-ref.xht => css21/positioning/absolute-non-replaced-width-026-ref.xht
rename : css21/absolute-non-replaced-width-026.xht => css21/positioning/absolute-non-replaced-width-026.xht
rename : css21/absolute-non-replaced-width-027.xht => css21/positioning/absolute-non-replaced-width-027.xht
rename : css21/reference/absolute-replaced-width-003a-ref.xht => css21/positioning/absolute-replaced-width-003a-ref.xht
rename : css21/absolute-replaced-width-003a.xht => css21/positioning/absolute-replaced-width-003a.xht
rename : css21/reference/absolute-replaced-width-003b-ref.xht => css21/positioning/absolute-replaced-width-003b-ref.xht
rename : css21/absolute-replaced-width-003b.xht => css21/positioning/absolute-replaced-width-003b.xht
rename : css21/reference/absolute-replaced-width-003c-ref.xht => css21/positioning/absolute-replaced-width-003c-ref.xht
rename : css21/absolute-replaced-width-003c.xht => css21/positioning/absolute-replaced-width-003c.xht
rename : css21/position-relative-022.xht => css21/positioning/position-relative-022.xht