pybootchartgui: Support labeling custom annotations

[bkylerussell]

Adds support for specifying custom annotations either individually through the command line --annotate option, or in bulk through an input file. This can be useful for decorating the bootchart with other meaningful time-based data not directly associated with the starting and stopping of a process.

When providing --annotate with a filename, the file should be formatted as follows:

<label>  <time>
<label2> <time2>

where is in the format HH:MM:SS, and will be used to calculate a position in the graph based on the bootchart ending time (displayed in the graph's header). will appear above the annotation in the process tree graph (above the seconds header label). If more than one label is given for a specific , these will be concatenated and separated by '/'.

This change also supports adding similarly formatted values directly on the --annotate option along with process names, though not at the same time as a filename.

Moves the ProcessTree instantiation above the annotation processing to take advantage of proc_tree.duration when calculating where should appear on the bootchart.

Signed-off-by: Kyle Russell bkylerussell@gmail.com