Move DiveList related methods/classes to own file.

The DiveList classes were a partial mess (and some of it is still in a
messy state). The classes that deal with it where done in 'qtHelpers.h',
the extern global variable in dive.h, a few methods here and there. This
concentrates most - but not all - functions in their own file. The reason
for that is to make the new developer faster when looking for things: if
it's a divecomputer related method, it should be in a single file, not
scattered around.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

subsurface.pro

@@ -39,6 +39,7 @@ HEADERS = \
 	profile.h \
 	qt-gui.h \
 	qthelper.h \
+	divecomputer.h \
 	qt-ui/about.h \
 	qt-ui/completionmodels.h \
 	qt-ui/divecomputermanagementdialog.h \
@@ -105,6 +106,7 @@ SOURCES =  \
 	parse-xml.c \
 	planner.c \
 	profile.c \
+	divecomputer.cpp \
 	worldmap-save.c \
 	qt-gui.cpp \
 	qthelper.cpp \