Wrote SQL script for creating the data base.
Some general layout decisions, problem form designed.
Added solution and evaluation forms. CSS cleaned up.
Added MathJax.
Implemented MathJax-driven preview and integrated it into problem.htm.
Replaced footer by header.
Design changes: no rounded corners, better colors, box-shadows.
Cleaned up CSS, changed link color.
Added main page with search/filter form.
Refined database design. The SQL script is now generated by MySQL Workbench.
Added borders to forms.
Better display of the problem text in solution and evaluation form.
First sketch of the task list, rather rudimentary.
Added rights to user table, save date of proposition for tasks.
Head line moved to left side of form.
Removed separate primary key for comments. Allowed the proposer_id in problems and solutions to be NULL.
Added remarks and publishing date columns to solutions.
Redesigned header.
Corrected spacing in forms, added :before to preview.
Added evaluation mechanism: starring with Mandelbrot fractal "stars."
Wrote problem page and created buttons.