tests/hgterm.ti

dirstate-v2: Document flags/mode/size/mtime fields of tree nodes

This file format modification was previously left incomplete because of
planned upcoming changes. Not all of these changes have been made yet,
but documenting what exists today will help talking more widely about it.

Differential Revision: https://phab.mercurial-scm.org/D11625

hgterm,
	am, km, mir, msgr, xenl,
	colors#8, cols#80, it#8, lines#24, pairs#64,
	acsc=``aaffggiijjkkllmmnnooppqqrrssttuuvvwwxxyyzz{{||}}~~,
	bel=^G, bold=\E[1m, clear=\E[H\E[2J, cr=\r,
	csr=\E[%i%p1%d;%p2%dr, cub=\E[%p1%dD, cub1=\b,
	cud=\E[%p1%dB, cud1=\n, cuf=\E[%p1%dC, cuf1=\E[C,
	cup=\E[%i%p1%d;%p2%dH, cuu=\E[%p1%dA, cuu1=\E[A,
	dch=\E[%p1%dP, dch1=\E[P, dl=\E[%p1%dM, dl1=\E[M,
	ed=\E[J, el=\E[K, enacs=\E)0, home=\E[H, ht=\t,
	hts=\EH, il=\E[%p1%dL, il1=\E[L, ind=\n,
	is2=\E[m\E[?7h\E[4l\E>\E7\E[r\E[?1;3;4;6l\E8, kbs=\b,
	kcub1=\EOD, kcud1=\EOB, kcuf1=\EOC, kcuu1=\EOA,
	kdch1=\E[3~, kf1=\E[11~, kf10=\E[21~, kf11=\E[23~,
	kf12=\E[24~, kf13=\E[25~, kf14=\E[26~, kf15=\E[28~,
	kf16=\E[29~, kf17=\E[31~, kf18=\E[32~, kf19=\E[33~,
	kf2=\E[12~, kf20=\E[34~, kf3=\E[13~, kf4=\E[14~,
	kf5=\E[15~, kf6=\E[17~, kf7=\E[18~, kf8=\E[19~,
	kf9=\E[20~, kfnd=\E[1~, kich1=\E[2~, kmous=\E[M,
	knp=\E[6~, kpp=\E[5~, kslt=\E[4~, op=\E[m, rc=\E8,
	rev=\E[7m, ri=\EM, rmacs=^O, rmcup=\E[2J\E[?47l\E8,
	rmir=\E[4l, rmkx=\E[?1l\E>, rmso=\E[m, rmul=\E[m,
	rs2=\E[m\E[?7h\E[4l\E>\E7\E[r\E[?1;3;4;6l\E8, sc=\E7,
	setab=\E[4%p1%dm, setaf=\E[3%p1%dm, sgr0=\E[m,
	smacs=^N, smcup=\E7\E[?47h, smir=\E[4h,
	smkx=\E[?1h\E=, smso=\E[7m, smul=\E[4m, tbc=\E[3g,
	u6=\E[%i%d;%dR, u7=\E[6n, u8=\E[?1;2c, u9=\E[c,