Import of observed time history data: Support multiple tables in same CSV file

[hhgs]

Add parsing and reading multiple headers to import multiple sections of data within same CSV-file.

Example of well pressure reporting (first and last line of data for each section):
Date; WBHP:B-3AHP; WTHP:B-3AHP(Daily_w.Whp_avg_wi); WTHP:B-3AHP(Daily_w.Whp_avg_p)
01.11.2015; 0.00; 0.00; 0.00

24.04.2024; 0.00; 0.00; 0.00
Date; WBHP:C-5AHP; WTHP:C-5AHP(Daily_w.Wh_avg_wi); WTHP:C-5AHP(Daily_w.Whp_avg_p)
16.05.2004; 337.87; 0.00; 85.03

24.04.2024; 0.00; 0.00; 0.00
Date; WBHP:E-5HI; WTHP:E-5HI(Daily_w.Whp_avg_wi); WTHP:E-5HI(Daily_w.Whp_avg_p)
20.09.2004; 0.00; 0.00; 0.00

24.04.2024; 0.00; 0.00; 0.00
Date; WBHP:G-1HI; WTHP:G-1HI(Daily_w.Whp_avg_wi); WTHP:G-1HI(Daily_w.Whp_avg_p)
16.03.2008; 0.00; 0.00; 0.00

24.04.2024; 0.00; 0.00; 0.00
Date; WBHP:G-3HP; WTHP:G-3HP(Daily_w.Whp_avg_wi); WTHP:G-3HP(Daily_w.Whp_avg_p)
11.04.2008; 0.00; 0.00; 0.00

24.04.2024; 0.00; 0.00; 0.00
Date; WBHP:H-2BHI; WTHP:H-2BHI(Daily_w.Whp_avg_wi); WTHP:H-2BHI(Daily_w.Whp_avg_p)
22.08.2013; 0.00; 200.29; 0.00

24.04.2024; 0.00; 0.00; 0.00
Date; WBHP:H-3HP; WTHP:H-3HP(Daily_w.Whp_avg_wi); WTHP:H-3HP(Daily_w.Whp_avg_p)
04.03.2013; 253.00; 0.00; 80.00

24.04.2024; 0.00; 0.00; 0.00