Remove the unused journal.c source file (its function have been subsumed into

memjournal.c).  Refactor some of the names in memjournal.c.  No functional
changes.

FossilOrigin-Name: 5f2a262d3f6b1531001326faf1d3b3d92c20a30a

main.mk

@@ -61,7 +61,7 @@ LIBOBJ+= vdbe.o parse.o \
          fts3_tokenize_vtab.o \
 	 fts3_unicode.o fts3_unicode2.o \
          fts3_write.o fts5.o func.o global.o hash.o \
-         icu.o insert.o journal.o json1.o legacy.o loadext.o \
+         icu.o insert.o json1.o legacy.o loadext.o \
          main.o malloc.o mem0.o mem1.o mem2.o mem3.o mem5.o \
          memjournal.o \
          mutex.o mutex_noop.o mutex_unix.o mutex_w32.o \
@@ -104,7 +104,6 @@ SRC = \
   $(TOP)/src/hash.h \
   $(TOP)/src/hwtime.h \
   $(TOP)/src/insert.c \
-  $(TOP)/src/journal.c \
   $(TOP)/src/legacy.c \
   $(TOP)/src/loadext.c \
   $(TOP)/src/main.c \