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Allow specifying the list of baselines from command line

This commit introduces the ability to set the list of baseline versions for performance tests through a command-line

flag (`--baselines`) or a system property (`org.gradle.performance.baselines`). The list must be specified as a

comma-separated list of versions or as a semicolon separated list of versions.

Two versions are handled particularly:

* `last` corresponds to the last release of Gradle

* `nightly` corresponds to the latest build of Gradle (`master` branch)

This commit also removes the "ad-hoc" mode for executing tests. The idea is to replace it with this flag, which

can be set to `nightly`. However, the "ad-hoc" mode skipped writing results to the database, in order to avoid

polluting the performance results DB with tests. If you want to do this, you need to set the `gradle.performance.db.url`

to a local, temporary database:


./gradlew cleanSmallOldJava smallOldJava cleanPerformanceTest performanceTest --scenarios 'clean Java build smallOldJava (daemon)' -x prepareSamples --baselines nightly -Porg.gradle.performance.db.url=jdbc:h2:./build/database


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Fix GC logging location in Maven performance tests

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Execute performance test scenarios on a fresh working copy

Reusing whatever state the last test left behind can make performance

seem better (because of preexisting caches) or worse (because of lots of output).

This makes the results dependent on the order in which the tests are executed.

It also prevented us from using incremental build for the project templates.

We now create a fresh copy of the template project for each test run,

fixing both of these problems at once.

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Extract performance test fixtures to separate project

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