Support --combined and --force flags for "dub test". Fixes #247.

Fix triggering an assertion when storing dependencies in advanced format. ...

The code was assuming that such dependencies had always exact versions, which is of course not always true (it should, however, be true for dependencies with a "path" field).

Fix condition for testing if a package description exists.

Ensure a deterministic file order when passing source files to the compiler. ...

This should avoid "random" triggering of compiler bugs that depend on the order of source files. See also rejectedsoftware/vibe.d#493.

Always use lower case package names internally, regardless of the package description.

Change path based sub package definitions to use a string instead of an object entry.

Remove main file detection for library configurations and don't let <packname>/<packname>.d match as a main file anymore.

The externally defined sub-packages don't have the name declared in the base package. This eliminates the double definition of a sub-packages name.

Fix Package.toJson and improve diagnostic output in case of JSON parsing errors.

Save all data from the package description when serializing. This fixes build problems which became apparent after the switch to the new "dub.json" as primary project description file.

Only treat "main.d" and "<packname>/main.d" as "mainSourceFile" for library targets.

Keeping track of the saved json file in the journal and some smaller changes.

Make "dub.json" the primary choice for a package description and handle "package.json" as a fallback.

Reverting unwanted commit.

When a package having externally defined subpackages is installed, they work. Currently not tested with the registry.

Automatic discovery of sub-packages added to package manager.

Add "release-nobounds" build type. Fixes #141.

Rename some BuildOptions to avoid D keywords.

Do not create an application configuration if the detected application main file is the same as the detected library main file.

Fix running "dub test" on an explicitly named package.

Implement the "test" command.

Add support for a "mainSourceFile" field. ...

The main source file is used as the root to access the whole package. This is important for dependency based building, such as with RDMD and for special build kinds, such as for a future unit test command. This also improves the robustness of "dub build --rdmd".

Main source files are automatically inferred as follows, if not explicitly given:
 1. search first in "source/", followed by "src/"
 2. take the first match of ("app.d", "main.d", "<pkgname>/main.d", "<pkgname>/<pkgname.d>") as the main file for the automatic "application" configuration
 3. take the first match of ("<pkgname>/all.d", "<pkgname>/package.d", "<pkgname>/<pkgname>.d") as the main file for the automatic "library" configuration

Properly infer build options and target names when collecting package build settings without a configuration. ...

Also don't assert when a "targetType": "none" package doesn't have a target name.

Adjust style of dub.internal.vibecompat.data.json to latest vibe.d and use vibe.data.json if available.

Move PlacementLocation to the proper module.

Some "dub describe" output corrections.

Improve warning message for non-existent source/import paths.

Import and string import files are now added to generated VisualD projects and "dub describe".

Remove dub.internal.std.process compatibility code as it doesn't support browse() and the compile status on older DMD versions isn't tracked anyway.

Fix error message in case of an empty source path. See #149.