class THaOutput

 Constructor

 Destructor

 Initialize output system. Required before anything can happen.

 Only re-attach to variables and re-compile cuts and formulas
 upon re-initialization (eg: continuing analysis with another file)

 Build list of EPICS variables and
 SCALER variables to add to output.

 Get the pointers for the global variables
 Also, sets the size of the fVariables and fArrays vectors
 according to the size of the related names array

 Process the EPICS data, this fills the trees.

 Process the variables, formulas, and histograms.
 This is called by THaAnalyzer.

 Process the file that defines the output

 Return integer flag corresponding to
 case-insensitive keyword "key" if it exists

 If the string contains "[anything]", we strip
 it away.  In practice this should not be fatal
 because your variable will still show up in the tree.

 Specialist private function needed by EPICs line parser:
 The problem is that the line was split by white space, so
 a line like "'RF On'=42"  must be repackaged into
 one string, i.e. "'RF" and "On'=42" put back together.

 To clean up EPICS variable names that contain
 bad characters like ":" and arithmetic operations
 that confuse TTree::Draw().
 Replace all 'badchar' with 'goodchar'

 Print error messages about the output definition file.

 Printout the definitions. Amount printed depends on verbosity
 level, set with SetVerbosity().

 Parse the string that defines the histogram.
 The title must be enclosed in single quotes (e.g. 'my title').
 Ret value 'result' means:  -1 == error,  1 == everything ok.

 From the block name, identify and save a specific grouping
 of global variables by adding them to the fVarnames list.

 For efficiency, at the end of building the list we should
 ensure that variables are listed only once.

 Eventually, we can have some specially named blocks,
 but for now we simply will use pattern matching, such that
   block L.*
 would save all variables from the left spectrometer.

 Set verbosity level for debug messages