org-table: Improve tables' speed in large buffers

org-table: Improve tables' speed in large buffers

* lisp/org-table.el (org-table-auto-recalculate-regexp):
(org-table-recalculate-regexp):
(org-table-calculate-mark-regexp):
(org-table-column-names):
(org-table-column-name-regexp):
(org-table-local-parameters):
(org-table-named-field-locations):
(org-table-current-line-types):
(org-table-current-begin-pos):
(org-table-current-ncol):
(org-table-dlines):
(org-table-hlines): Improve docstrings.

(org-table-current-begin-line): Remove variable.

(org-table-save-field): New macro.

(org-table-get-specials): Remove function.
(org-table-analyze): New function, renamed from
`org-table-get-specials'.

(org-table-find-row-type): Remove function.
(org-table--row-type): New function, renamed from
`org-table-find-row-type'.

(org-table-align): Use new macro.

(org-table-field-info):
(org-table-insert-column):
(org-table-delete-column):
(org-table-move-column):
(org-table-sort-lines):
(org-table-paste-rectangle):
(org-table-wrap-region):
(org-table-current-field-formula):
(org-table-get-formula):
(org-table-maybe-recalculate-line):
(org-table-eval-formula):
(org-table-get-range):
(org-table--descriptor-line):
(org-table-recalculate):
(org-table-expand-lhs-ranges):
(org-table-edit-formulas):
(org-table-show-reference):
(org-table-get-remote-range): Apply changes above.  Refactor code.

(org-table-check-inside-data-field):
(org-table-current-column):
(org-table-current-dline):
(org-table-line-to-dline):
(org-table-copy-region):
(org-table-rotate-recalc-marks):
(org-table-fedit-post-command):
(org-table-fedit-convert-buffer):
(org-table-highlight-rectangle): Refactor code.

(org-table-goto-field): New function.

* lisp/org-capture.el (org-capture-place-table-line): Apply change made
  to table internals.

The point of this commit is to remove dependency on `org-current-line'
and `org-goto-line', which are both expensive in large buffers.  Now,
lines are relative to the beginning of the current table instead of
global (i.e., relative to the beginning of the buffer).