[FIX] hw_escpos:  Replaced "tab" by space

call to self.open() had a tab instead of spaces
Revert "[FIX] web: grid headers should be aligned properly"

This reverts commit 4c335588a1f5d6d1f03e17aa20e37ffe4197447c.
It leads to table widths inconsistencies: The tables take more width then before, and overflow much more than before. This can be seen in "Accounting" > "Journal Entries", in the list of the form view
[FIX] web : Stages positioned properly when there is no sheet

[FIX] web : Stages positioned properly when there is no sheet