30201
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10923 delete should raise error when there is no file
https://pharo.fogbugz.com/f/cases/10923
10924 Simplifying ensure* and create protocol
https://pharo.fogbugz.com/f/cases/10924+ writeStreamForFileNamed:replace:do: using ensureDeleted then ensureDelete Diff information: http://smalltalkhub.com/mc/Pharo/Pharo30/main/UpdateStreamer-Core-StephaneDucasse.22.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Tools-StephaneDucasse.1145.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Tests-StephaneDucasse.551.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/System-Support-StephaneDucasse.851.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/StartupPreferences-StephaneDucasse.97.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/System-Changes-StephaneDucasse.214.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Polymorph-Widgets-StephaneDucasse.841.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Multilingual-Tests-StephaneDucasse.27.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Monticello-StephaneDucasse.816.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/FuelTests-StephaneDucasse.319.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/HudsonBuildTools20-StephaneDucasse.34.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/FileSystem-Zip-StephaneDucasse.11.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/FileSystem-Tests-Core-StephaneDucasse.53.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/FileSystem-Memory-StephaneDucasse.35.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/FileSystem-Disk-StephaneDucasse.60.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/FileSystem-Core-StephaneDucasse.91.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/CompressionTests-StephaneDucasse.23.diff http://smalltalkhub.com/mc/Pharo/Pharo30/main/Compression-StephaneDucasse.126.diff
