Translating project_location_name and column heads into strings automatically

[smartie2076]

When only using numbers as project location names of for the column heads of the csv files, the simulation terminates. This is because the excel reader parses both as a integer/float value and not as a string.
For project_location_name an error message is shown, but for the column heads, the number is interpreted as a column number and leads to an error futher down the line.

The documentation should mention the naming convention for labels/column heads. Maybe ways to solve this from a coding perspective can also be explored.