Merge all changes from index_xinfo, including the move of the pragma table

into the separate pragma.h file.

FossilOrigin-Name: 21e95d28a51e56b45a9d4166475972535e53f954

main.mk

@@ -133,6 +133,7 @@ SRC = \
   $(TOP)/src/pcache.h \
   $(TOP)/src/pcache1.c \
   $(TOP)/src/pragma.c \
+  $(TOP)/src/pragma.h \
   $(TOP)/src/prepare.c \
   $(TOP)/src/printf.c \
   $(TOP)/src/random.c \
@@ -357,6 +358,7 @@ HDR = \
    $(TOP)/src/pager.h \
    $(TOP)/src/pcache.h \
    parse.h  \
+   $(TOP)/src/pragma.h \
    sqlite3.h  \
    $(TOP)/src/sqlite3ext.h \
    $(TOP)/src/sqliteInt.h  \