Purpose of some files in the Library folder

Accoring to "Using External Version Control Systems with Unity", some files in the Library folder should be versioned (*.asset and BuildPlayer.prefs) and some other should be ignored.

Some files in the Library folder do not match either of them. Should they be ignored, too? Namely these are:

• AssetVersioning.db
• expandedItems
• ProjectUsesCompressTexturesOnImport

Also, some of the files that should be versioned change every time, even if I just open and close Unity immediatly. What's inside? Does it harm to add them to svn:ignore?

• MonoManager.asset
• BuildSettings.asset (sometimes)

(External version control support is enabled)