Make it explicit that the canonical replacement for Visual Studio .sln files are SUBDIRS .pro files, not Session.

From the webform feedback, maybe the response can be incorporated somehow
into the "Managing Sessions" page:

> Why doesn't Qt have solution files like Visual Studio?

Because Visual Studio solution files only provide a two-layer hierarchy.
This is too limiting for large projects made of large structured components.

> If you have an application that depends on several libraries (each
> one in its own project), the only option you have is to use the
> Session feature which isn't exportable between developers.

That's not the only option. Another option (and the right one to use)
in this case is to use a "SUBDIRS" .pro file, i.e. something like

TEMPLATE = subdirs

SUBDIRS = plugin_coreplugin \
...\
/some/other/profile.pro

Dependencies can be set up there, but is a bit tricky. That's why
the next version (and current git master branch) will contain a
wizard to help with that task.

A Qt Creator "Session" is really just a temporary collection of projects
(including e.g. SUBDIRS projects) that a developer works on. It
is "personal", not meant to be shared, and not supposed to reflect
project structure. It contains "personal" data like bookmarks and
breakpoints that are usually not of interest to other developers
working at the same project(s).

> In an ideal world, Qt would allow the user to create a .sln file
> that stores project dependency information using relative paths
> like Visual Studio does.

We just call it a "SUBDIRS .pro" file.

> Also, the .sln (or equiv) file could be checked into source control like
> the .pro file so that someone else could check out the entire source
> tree and simply open up the .sln file in qtcreator and all of the
> referenced projects (and their dependency information) would be
> read in (again just like Visual Studio).

The SUBDIRS .pro file can be checked in as a VS .sln file. We use it
ourselves, nested over several levels, in the Qt Creator sources and
for Qt itself.