Support various formats of show_legend values

[bikegeek]

Describe the Problem

This is transferred from METviewer Issue #561

While attempting to generate series plots (line plots) using METviewer reusing existing XML config files, the legends are missing in 6.0 release. However, when generating these plots using METviewer 5.1 the legends are plotted. NOTE the show_legend setting was introduced into the METplotpy config files in the METplotpy 3.0/METviewer 6.0 coordinated release.

METviewer creates a YAML config file with show_legend values as strings-'1' vs 1. The METplotpy code is expecting a numerical value of 1 to show legend(s), with any other value for "do not show" legend(s). This is more readily fixed in the METplotpy code to ensure that command line users can use 1, or '1' or 'true'|'True', etc. This is why the issue was moved from METviewer to METplotpy.

Expected Behavior

Plot is generated using the YAML config file created by METviewer, but no legends are present.

Using the following data and yaml config file, the resulting plot has no legend:
plot_20250109_014251.data.txt
plot_20250109_014251.yaml.txt

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[bikegeek]

METviewer is generating a YAML config file (that is used to generate the plot via METplotpy) with the show_legend setting to '1'. The METplotpy code expecting a numerical value of 1. Modifying the config.py to convert '1' and any variation of True (i.e. TRUE, true, etc) to numerical 1. This will provide better support for users who generate plots via command line.