class library: allow NamedControl.new to return non-arrayed Lag
Merge pull request #974 from totalgee/master

class library: remove unnecessary conversion of lag argument to array (fixing issue 973)
class library: signal blend returns a signal. Fixes issue #1004
class library: add a more informative error message to scope

When the computer sleeps, the shm interface may get lost. Then the server, if not internal, can't scope. Instead it tries to use the internal stethoscope, which now throws a more informative error.
Note: the GUI redirects in this case are extremely intransparent and should be refactored.
class library: change from spaces to tabs in QT related files

Instead of spaces, tabs are standard in the sc class libraray. This change avoids unintended mixing of conventions.
ide: menu entry for toggling server dumpOSC
ide: keep menu for oscDump open for toggle
class library: change from spaces to tabs in QT related files
plugins: buf ugens don't end when no valid buffer is available yet