Use a distinct icon for cancelled builds

Dependencies

• [2] 6KIJX24R Get rid of unnecessary [%- and -%] tags
• [3] T6KISLR6 Fix indentation
• [4] 3TL5XENE Different icons (darker red) for cancelled builds. Fixes #25.
• [5] N2ZF5JUL Use a different icon for aborted builds
• [6] E5DMQRPO Remove unnecessary whitespace in the HTML output
• [7] XBLTCIUZ Show build status 2 and 5 in the same way
• [*] IK53RV4V
• [*] D5QIOJGP * Move everything up one directory.

Change contents

• replacement in src/root/common.tt at line 206
  [2.4112]→[3.390:466](∅→∅),[3.2252]→[3.390:466](∅→∅)
  − <img src="/static/images/cancelled_[% size %].png" alt="Cancelled" />
  [2.4112]

  [2.4147]
  + <img src="/static/images/forbidden_[% size %].png" alt="Cancelled" />
• file addition: forbidden_16.png (----------)
  [10.2196]