Speed up get_history, fix html bug, revert region optimisation changes

What's Changed

Speed up get_history with minimal response

• Speed up get_history with minimal response by @springfall2008 in #1116

Fix bug in HTML output giving the entire charge/discharge window values for PV/Load

• Fix html bug, put region optimisation back to 120 minutes for speed by @springfall2008 in #1117

Reverted some changes to region optimisation due to bad results in some cases

• Region optimisation alignment fix by @springfall2008 in #1119
• Revert optimise regions code change by @springfall2008 in #1121

Full Changelog: v7.19.3...v7.19.4