Remove the M_WALL_SHIELDED flag. Instead, use the function

mons_is_wall_shielded() to determine whether a monster can pass 
through/be shielded by walls, as it's a more flexible approach.  The 
function currently only checks for a monster class with a rock habitat, 
but it could be expanded to allow for other cases.

Replace the M_WALL_SHIELDED flag with the M_INSUBSTANTIAL flag, and 
check for the latter instead of hardcoding a list of monsters in 
mons_is_insubstantial().


git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3201 c06c8d41-db1a-0410-9941-cceddc491573

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