PyREPL: Add ctrl+up/down for multiline history retrieving

[Lucas_Malor]

Well, no. Home and end go to the start / end of the line, not of the code block:

@hugovk

• beginning-of-line: Move cursor to the first character of the current line (Ctrl+A or Home)
• end-of-line: Move cursor to the last character of the current line (Ctrl+E or End)