skin engine: New logical 'and' and 'or' tags to evaluate multiple tags in a single conditional.

Use these tags to stop having multiple conditionals.. e.g:
OLD: %?C<%?Ia<something>>
NEW: %?and(%C, %Ia)<something>

Change-Id: Ia3bbe4611cf808e87dcd1b1147181461fa08294a

1 files changed, 4 insertions, 0 deletions

diff --git a/manual/appendix/wps_tags.tex b/manual/appendix/wps_tags.tex
index d882baadea..0096075695 100644
--- a/manual/appendix/wps_tags.tex
+++ b/manual/appendix/wps_tags.tex
@@ -565,6 +565,10 @@ Example: \config{\%ax\%V(\dots)}
       \config{operand}: either a second tag, a number, or text.\newline
       \config{[option count]}: optional parameter used to select which parameter
         of a tag to use when the tag has multiple options, e.g. \%?pv<a|b|c|d>\\
+\config{\%and(tag1, tag2, ..., tagN)}\newline
+    & Logical ``and'' operator. Will be evaluate to true if all the tag parameters are true.\\
+\config{\%or(tag1, tag2, ..., tagN)}\newline
+    & Logical ``or'' operator. Will be evaluate to true if any of the tag parameters are true.\\
 \end{tagmap}
 
 Examples of the \%if tag:\\