Add Apply case to ScalaCompletions. Fixes #1001218

This allows scalaCompletions to handle method invocation completions.
Also refactored scalaCompletions to tidy things a little.
remove unneeded comment
review comments - make stuff options
give correct start point in completion

for calls to methods in scope
remove val in for
fix midword method completions
Fix source file caching in presentation compiler.

Removed the sourceFile map altogether. Caching is performed now at the
level of `InteractiveCompilationUnit`, who may keep the last SourceFile
instance. The default implementation does not cache anything, but
`ScalaCompilationUnit` does.

In the process, removed a number of `withSourceFile` methods on project
and presentation compiler classes. These may break plugins.

Fixed #1001859
Add equals/hashCode for ScalaProject.
Added back `withSourceFile` and marked them @deprecated.
Re-enabled PC tests that pass now.
Reviewer's comment.
Pushes the output of InterruptedExceptions to debug log level

This is a companion to https://github.com/scala-ide/scala-ide/pull/481 in the sense that testing this PR revealed InterruptedExceptions being treated and passed in the askOption exception capture mechanism, in very long documentation requests.
This logs such exceptions at debug level, and hints at issue in comments.
Refactorings in refactoring suite

- Rename of `ActionWithNoWizard` to `RefactoringActionWithoutWizard`
- Introduction of `RefactoringActionWithWizard`
- Introduction of `ParameterlessScalaIdeRefactoring`
Revert "Two new profiles for supporting legacy and new sbt dependencies"

This reverts commit 633e0fe41868b7a47842f5f9feaa815812840375.
Removed duplication of ${sbt.version} value in Scala profiles
Merge pull request #516 from dragos/issue/thread-safe-source-files-1001859

Fix caching of SourceFiles
Adds a draft AUTHORS file.

Generated from:

    git log --format="%aN %ae" |sort -u > AUTHORS
    find ./ -type f -iname "*.scala" -exec perl -nle 'print "$1" if /^[^\n]+?\@author\s+([^\n]*)\s*$/' '{}' \; | sort -u >> AUTHORS
Removes obsolete author info.

Commit generated with:

    find -iname "*.scala" -type f -execdir perl -pe 's/^.*?\@author.*$//sg' -i '{}' \;
Obfuscate AUTHORS file to avoid spammers collecting email
Merge pull request #541 from huitseeker/suppress-interrupted-exception

Pushes the output of InterruptedExceptions to debug log level